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21.
22.
Dubinina V. V. Egorenkova N. P. Pozharova E. A. Smirnitsky V. A. 《Physics of Atomic Nuclei》2019,82(2):83-88
It is shown that, upon the stopping of a negatively charged kaon and its absorption by a nucleus, there arise particles whose appearance does not comply with thermodynamic evaporation theory. An identification of these particles by various methods makes it possible to evaluate the nearly identical yields of 3H and 3He nuclei. This result may serve as an indication that direct reactions induced by interaction with 4He are observed in K−-meson absorption in nuclei.
相似文献23.
The absorption of slow K? mesons in nuclear emulsion through the mesonic and nonmesonic channels has been measured. It has been shown that K? mesons are absorbed in the surface (diffuse) layer of a nucleus. The results are in qualitative agreement with theoretical calculations involving the mesonic and nonmesonic potentials of the absorption of kaons by light and heavy nuclei of nuclear emulsion. 相似文献
24.
Results of observation and analysis of e ± appearing in the interaction of 32-GeV positrons with nuclear emulsion have been reported. The angular distributions of particles have been measured in the range of 0°–180°. The energy of particles has been measured in the angular range of 145°–180° and values of the Bjorken variable x B have been calculated. The distribution in x B corresponds to values smaller than unity at Q 2 > 7.0 (GeV/s)2. This means that e ± with energies lower than 250 MeV cannot be attributed to multinucleon correlations. 相似文献
25.
V. V. Dubinina N. P. Egorenkova V. I. Krotkova E. A. Pozharova V. A. Smirnitsky 《Physics of Atomic Nuclei》2004,67(3):518-523
The azimuthal anisotropy of the emission of fragments and relativistic particles in collisions between 56Fe nuclei of momentum 2.5 GeV/c per nucleon and photoemulsion nuclei is measured. For semicentral collisions at impact-parameter values in the range 0.12 ≤ b/bmax ≤ 0.70, charged fragments and relativistic particles are predominantly emitted in the direction orthogonal to the nuclear-reaction plane. The azimuthal-asymmetry parameter P2 for fragments whose charge numbers are Z = 1, 2 and Z ≥ 3 takes values of, respectively, ?0.192±0.057, ?0.28±0.07, and ?0.39±0.12. Evaporated b particles have an isotropic azimuthal distribution. 相似文献
26.
V. V. Dubinina N. P. Egorenkova V. I. Krotkova E. A. Pozharova V. A. Smirnitskii 《JETP Letters》2005,82(1):14-16
The azimuthal anisotropy of the emission of α particles in collisions of the 22Ne, 24Mg, 56Fe, and 197Au nuclei with photoemulsion nuclei has been measured at projectile energies Epr = 1.88–10.6 GeV/nucleon. The results are compared with similar measurements for protons. It has been found that the ratio of the azimuthal anisotropy coefficients v2 for α particles and protons is equal to 6 ± 2 at low energies Epr ≈ 2 GeV/nucleon, whereas these coefficients coincide with each other for energies Epr ≥ 4 GeV/nucleon. This difference may indicate that, at low projectile energies, α particles are formed predominantly at the early stage of a collective flow. Formation of α particles for Epr ≥ 4 GeV/nucleon likely occurs at the stage of nuclear matter scattering. 相似文献
27.
V. A. Ditlov V. V. Dubinina N. P. Egorenkova V. I. Krotkova E. A. Pozharova V. A. Smirnitsky 《Physics of Atomic Nuclei》2005,68(11):1787-1789
The mean number ?Nb〉 of particles evaporated in the interaction of 22Ne, 32S, and 56Fe nuclei with photoemulsion nuclei was measured as a function of the number of alpha particles emitted within the fragmentation cone. It is found that ?Nb〉 decreases with increasing number of the alpha particles and increases with increasing number of projectile nucleons involved in the interaction with a target nucleus and that ? Nb〉 is a linear function of the excitation energy Eex of the target-nucleus residue. The maximum experimental value of the mean number of evaporated particles is ?Nbmax〉 ? 12–13, which corresponds to Eexc ? 540 ± 60 MeV. 相似文献
28.
G. I. Robertson L. M. Dubinina und L. Dorfman 《Fresenius' Journal of Analytical Chemistry》1958,164(4):444-445
Ohne Zusammenfassung 相似文献
29.
30.
The annihilation of slow (∼7 MeV) antiprotons in nuclear emulsion has been studied. The yields and energy spectra of p, d, t, and α particles in the evaporation region have been measured. The shape of the spectra of p, d, and t is in agreement with the Maxwell distribution and the excitation energy of a nucleus is consistent with a theoretical estimate
for evaporation from the equilibrium state. The probability of the absorption of antiprotons inside the nucleus estimated
from the multiplicity of h particles is ɛ = (2.0 ± 0.6) × 10−2. The relative d/p yield coincides with a similar ratio appearing in the capture of slow π− mesons by nuclei in the nuclear emulsion. The yields of t and α particles in the process of the annihilation of antiprotons are much higher than those in a similar process for pions.
To identify g particles (0.29 < β < 0.70), energy losses dE/dx on ionization and multiple scattering have been measured. In this velocity region, the yields of p, d, t, and pions have been observed. The ratios (n
d
/n
p
)
g
, (n
d
/n
p
)
b
, and n
d
/n
p
measured in the capture of π− mesons are almost the same. In this velocity range (g particles), α particles have not been observed. 相似文献